Help getting 4g63 started

blueman803 · Post by **blueman803** » Sat Mar 18, 2006 10:30 am

I got it started.

Only one problem now, I think my o2 is shot. I checked the wiring and its all correct with no resistance between the ecu and the 02. I checked the resistance of the o2 and there is an infinite amount between the signal wire and the ground. This should have a resistance value correct?

jakobsladderz · Post by **jakobsladderz** » Sat Mar 18, 2006 4:12 pm

No, O2 sensor is open circuit when cold. They need to get to somewhere around 3-400Â°C before they start to conduct (7-800 before they conducts well).. Probably is ok, the onle way to check is to see if there's voltage when running rich and warmed up, or take it out and warm it up on the stove (not too fast), then check how quick the output changed when going from rich (in the flame/exhaust) to lean (out).. Don't know the specifics of that test though.

blueman803 · Post by **blueman803** » Sat Mar 18, 2006 7:37 pm

Its a four wire sensor, how long should that take before it reports a signal?

blueman803 · Post by **blueman803** » Sun Mar 19, 2006 1:47 pm

I can get it to idle, but I am having a really hard time getting the timing to match up. I can adjust the trigger angle anyway I want, and the crank pulley mark never even comes close to 15 degrees btdc. Am I missing something? Shouldn't adjusting the trigger angle change the timing?

feck · Post by **feck** » Sun Mar 19, 2006 3:39 pm

How are you getting the tach signal? Is it EDIS or distirbuter set up. I recently installed the same setup on an older version of that engine. I found the most reliable way to get the car started and idle well was to set the dizzy to trigger at 10deg. This let me get a stable cranking spark at a known advance, and then it needed quite alot more advance once it caught to get it to idle happily (~25deg BTDC).

When I tried setting the trigger at 60-70deg BTDC for some reason the spark seemed to be all over the place and I couldn't get it to run with less than ~30deg advance.

Cheers
Daniel

blueman803 · Post by **blueman803** » Sun Mar 19, 2006 3:55 pm

I am using the neon 420a board mods with internal ignitors. The rpm signal is coming from the cam angle sensor and crank angle sensor. Used the appropriate pick up resistors to get that working.

Setting the ignition with the stock ecu consisted of moving the cam angle sensor until the timing reached 8 degrees btdc. From my reading, adjusting the trigger angle is doing the exact same thing as rotating the CAS. Is this correct? I noticed mine idled a lot better around 30 degrees BTDC, and the recommend trigger angle was in the 70's. I

blueman803 · Post by **blueman803** » Sun Mar 19, 2006 5:21 pm

I took a quick log, anyone see anything funky? I am waiting on an o2, sense apparently mine is dead. Should get that up and going tomorrow.

blueman803 · Post by **blueman803** » Wed Mar 22, 2006 12:11 pm

Another datalog. The idle starts off at 40 kpa and then decays until the engine dies.